<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
 
        .kuang{
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -10;
            background-image: linear-gradient(180deg,rgb(78, 168, 241),rgb(37, 91, 241));

        }
        .bubble{
            position: absolute;
            border-radius: 50%;
            border: 2px solid #fff;
            box-shadow: inset 0 0 8px  #fff;
            animation: flutter 10s infinite;
            opacity: 0;
        }
        @keyframes flutter {
            0%{
                transform: translateX(0);
                bottom: -100px;
                opacity: 1;
            }
            50%{
                transform: translateX(100px);
                opacity: 0.5;
            }

            
            100%{
                transform: translateX(0px);
                bottom: 100%;
                opacity: 0;

            }
        }
        .bubble:nth-child(1){
            left: -10%;
            width: 50px;
            height: 50px; 
            animation-duration: 9s;
            animation-delay: 0.1s;
        }
        .bubble:nth-child(2){
            left: 15%;
            width: 20px;
            height: 20px;
            animation-duration: 6s;
            animation-delay: 1.5s;

        }
        .bubble:nth-child(3){
            left: 20%;
            width: 60px;
            height: 60px;
            animation-duration: 10s;
            


        }
        .bubble:nth-child(4){
            left: 30%;
            width: 30px;
            height: 30px;
            animation-duration: 5.5s;
            animation-delay: 1.5s;

        }
        .bubble:nth-child(5){
            left: 40%x;
            width: 50px;
            height: 50px;
            animation-duration: 12s;
            


        }
        .bubble:nth-child(6){
            left: 50%;
            width: 20px;
            height: 20px;
            animation-duration: 6s;
            animation-delay: 1s;

        }
        .bubble:nth-child(7){
            left: 60%;
            width: 40px;
            height: 40px;
            animation-duration: 8s;
            animation-delay: 1s;

        }
        .bubble:nth-child(8){
            left: 65%;
            width: 60px;
            height: 60px;
            animation-duration: 15s;
          
        }
        .bubble:nth-child(9){
            left: 80%;
            width: 55px;
            height: 55px;
            animation-duration: 9s;
            animation-delay: 0.5s;
            
        }
        .bubble:nth-child(10){
            left: 100%;
            width: 40px;
            height: 40px;
            animation-duration: 12s;

        }
    </style>
</head>
<body>
    <div class="kuang">
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
        <div class="bubble"></div>
    </div>
    
</body>
</html>
 
